Unintended parametric ejection of ions from an ion cyclotron resonance trap by two-electrode axialization
Eur. J. Mass Spectrom. 15 (2), 283-291, 2009
Submitted to Cluster Science: 5 January 2010
Last Update: 6 January 2011

10.1255/ejms.962
OA Status: unknown

Abstract

Azimuthal quadrupolar excitation is a commonly used technique in the field of ion cyclotron resonance mass spectrometry, in particular in combination with buffer-gas collisions to achieve axialization of the stored ions. If the quadrupolar excitation is applied with only one phase to a set of two opposing ring segments (rather than the ``regular' method where two sets of electrodes are addressed with opposite polarities). parametric resonance effects at the frequencies 2 nu(t) and nu(p)=nu(+)-nu(-) can lead to unintended ejection of ions from the trap. These parametric resonances have been revisited both theoretically and experimentally: multipole components of different azimuthal excitation schemes are derived by a simple vector representation of the excitation signal applied to the ring segments. Thus, parametric contributions can be easily identified, as demonstrated for the two-electrode and the four-electrode quadrupoLar excitation schemes as well as further examples. In addition, the effect of the single-phase two-electrode quadrupolar excitation is demonstrated for storage and axialization of cluster ions.

Classifications

Document Type experimental
Research Field Experimental Techniques

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